中圖分類(lèi)號(hào)： TN79 文獻(xiàn)標(biāo)識(shí)碼： A DOI：10.16157/j.issn.0258-7998.222793 中文引用格式： 劉琛昊,，金革. 皮秒級(jí)多脈沖時(shí)間間隔大量程時(shí)間測(cè)量系統(tǒng)設(shè)計(jì)[J].電子技術(shù)應(yīng)用,，2022，48(10)：108-112. 英文引用格式： Liu Chenhao,，Jin Ge. A large range time measuring system study of picosecond multi-pulse time interval[J]. Application of Electronic Technique,，2022，48(10)：108-112.
A large range time measuring system study of picosecond multi-pulse time interval
Liu Chenhao1,，Jin Ge2
1.School of Microelectronics,，University of Science and Technology of China,，Hefei 230026，China,； 2.Department of Modern Physics, School of Physical Sciences,，University of Science and Technology of China，Hefei 230026,，China
Abstract： Time measurement technology has important applications in laser ranging, particle identification, radioactive nuclear medicine engineering and other fields. This design uses the time interpolation technology based on FPGA EP3C55F484C6 which produced by Altera Corp to achieve high precision TDC. By combining with the upper computer, the number of stop pulses corresponding to a start pulse can be adjusted in a single measurement, which can solve the problem of repeated measurement when there are multiple targets to be measured in a measurement. After the test, the design resolution is 90.08 ps, the measurement accuracy is 33.54 ps, the integral nonlinear INL range is(-0.34 LSB~+0.27 LSB), and the differential nonlinear DNL range is(-0.28 LSB~+0.31 LSB).
Key words : time-to-digital converter,；FPGA；multi-pulse measuring,；carry chain
0 引言
科學(xué)實(shí)驗(yàn)中許多信息是以時(shí)間信息方式存在于探測(cè)器的輸出信號(hào)中,，典型的例子如飛行時(shí)間測(cè)量(Time of Flight，TOF)：發(fā)射端發(fā)射信號(hào)到待測(cè)物體后,，被反射回探測(cè)器,，通過(guò)對(duì)往返時(shí)間間隔進(jìn)行分析，可以得到距離信息,，而所測(cè)得時(shí)間精度也就決定了TOF系統(tǒng)的精度[1],。而時(shí)間數(shù)字轉(zhuǎn)換器則是在時(shí)間分析中使用較多的測(cè)量手段[1-2]。在傳統(tǒng)的實(shí)驗(yàn)中,，若存在多個(gè)待測(cè)物體,，探測(cè)器會(huì)收到多個(gè)信號(hào)，需進(jìn)行多次測(cè)量,，增加實(shí)驗(yàn)的復(fù)雜度,，且無(wú)形中增加實(shí)驗(yàn)成本。針對(duì)這一情況,，本文設(shè)計(jì)了在一次測(cè)試中,，一個(gè)“開(kāi)始”信號(hào)可以對(duì)應(yīng)多個(gè)“停止”信號(hào)進(jìn)行測(cè)量的時(shí)間數(shù)字轉(zhuǎn)換系統(tǒng)。
